EIGRP Notes – Overview and Neighbors

I’m back to studying for my CCNP R&S. I’m going back with a new mindset. I want to read to understand and do a lot of labs that will help make me understand the concepts.

What is the basic EIGRP configuration command?

router eigrp asnnetwork net-id wildcard-mask

What is the concept of the router EIGRP configuration commands?

For routers to become neighbors they must be configured with the same ASN number. Enabled interfaces are matched by the network command. Those interfaces enabled will attempt to discover neighbors on that interface by sending EIGRP multicast hello messages. Advertisements are also made to neighbors on the enabled interface about the connected subnet.

If no wildcard mask is configured with the network command then it will use the classful network number. The wildcard mask acts like an ACL by applying a logic comparing the network id with each interface’s IP address.